Installation manual
5
E(D/B)(H/L)Q011~016BB
Unit for air to water heat pump system
4PW67904-1 – 01.2011
Application 2
Space heating only application without room thermostat connected to
the unit. The temperature in each room is controlled by a valve on
each water circuit. Domestic hot water is provided through the
domestic hot water tank which is connected to the unit.
1 Unit
2 Heat exchanger
3 Backup heater
(1)
4 Pump
5 Shut-off valve
6 Collector (field supply)
7 Motorised 3-way valve (delivered with the domestic hot
water tank)
8 By-pass valve (field supply)
9 Booster heater
(2)
10 Heat exchanger coil
11 Domestic hot water tank (optional)
FHL1...3 Floor heating loop (field supply)
T1...3 Individual room thermostat (field supply)
M1...3 Individual motorised valve to control loop FHL1...3
(field supply)
UI User interface
Pump operation
With no thermostat connected to the unit (
1
), the pump (
4
) can be
configured to operate either as long as the unit is on, or until the
required water temperature is reached.
Space heating
The unit (
1
) will operate to achieve the target leaving water
temperature as set on the user interface.
Domestic water heating
When domestic water heating mode is enabled (either manually by
the user, or automatically through a schedule timer) the target
domestic hot water temperature will be achieved by a combination of
the heat exchanger coil and the electrical booster heater
(3)
or backup
heater
(4)
.
When the domestic hot water temperature is below the user
configured set point, the 3-way valve will be activated to heat the
domestic hot water by means of the heat pump. In case of large
domestic hot water demand or a high domestic hot water
temperature setting, the booster heater (
9
)
(5)
or backup heater (
3
)
(6)
can provide auxiliary heating.
(1) For tank without electrical booster heater (EKHTS), the backup heater will
be used in domestic water heating mode.
(2) Only applicable for tank with built-in electrical booster heater (EKHW*).
INFORMATION
Details on pump configuration can be found under
"10.3. Pump operation configuration" on page 29
.
NOTICE
When circulation in each floor heating loop (FHL1...3) is
controlled by remotely controlled valves (M1...3), it is
important to provide a by-pass valve (
8
) to avoid the flow
switch safety device from being activated.
The by-pass valve should be selected as such that at all
time the minimum water flow as mentioned under
"6.5. Water pipework" on page 16
is guaranteed.
It is recommended to select a pressure difference
controlled by-pass valve.
FHL1
FHL2
FHL3
6
5
4
8
2
3
1
M
M1
T1
M2
T2
M3
T3
11
7
10
9
UI
(3) Only applicable for tank with built-in electrical booster heater (EKHW*).
(4) Only applicable for tank without electrical booster heater (EKHTS).
(5) Only applicable for tank with built-in electrical booster heater (EKHW*).
(6) Only applicable for tank without electrical booster heater (EKHTS).
INFORMATION
It is possible to connect either a 2-wire or a 3-wire 3-way
valve (
7
). Make sure to fit the 3-way valve correctly. For
more details, refer to
"Procedure for wiring the 3-way
valve" on page 26
.
Only for EKHW*:
■
At low outdoor temperatures when space heating
demand is higher, the unit can be configured to have
the domestic hot water heated by the booster heater
exclusively. This assures that the full capacity of the
heat pump is available for space heating.
■
Details on domestic hot water tank configuration for
low outdoor temperatures can be found under
"10.10.
Field settings" on page
32
, field settings
[5-02] to [5-04].
Only for EKHTS:
■
At low outdoor temperatures when space heating
demand is higher, the unit can be configured to have
the domestic hot water heated by the heat pump and
backup heater at the same time. This assures that the
interruption of space heating is limited to a minimum.
■
Details on domestic hot water tank configuration for
low outdoor temperatures can be found under
"10.10.
Field settings" on page
32
, field settings
[5-02] to [5-04].
NOTICE
Be sure that the correct field settings are active or selected
according to the applicable tank type. See field settings in
"[4] Backup/booster heater operation and space heating
off temperature" on page 34
for more details.
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